Diagnosis of Critical Risk Sources in the Operation Safety of the Central Route Project of South-to-North Water Diversion Based on the Improved FMEA Method

Table 1

Evaluation criteria for the three factors of FMEA of the Central Route Project.

Rating	Frequency of occurrence ()	Severity ()	Difficulty to detect ()	Fuzzy number
VL	Rarely happens	No impact	Very high probability of detection	(0, 0, 1, 2)
L	Less frequently	Minor impact	High probability of detection	(1, 2, 3, 4)
M	Occasionally	Moderate impact	Medium probability of detection	(3, 4, 6, 7)
H	Recurring	Serious impact	Low probability of detection	(6, 7, 8, 9)
VH	Inevitable	Bad impact	Very low probability of detection	(8, 9, 10, 10)